Build a generalized SaaS product that doesn't rely on proprietary information, make it polished enough that there's a chance the organization will start using i

Build a generalized SaaS product that doesn't rely on proprietary information, make it polished enough that there's a chance the organization will start using it, then arrange for decision-makers in your the org to find out about it without exposing yourself. Otherwise your boss might get some minimal level of credit for this, but you're not going to get anything out of it, and there is every chance of it backfiring spectacularly for you if that would provide an easy way for the organization to more efficiently absorb 100% of your work product (or if it would limit embarrassment for well-connected managers).